My Msn Wont Sign In

Hello,
My MSN wont let me sign in.. but it will let other accounts sign in, every time i try it comes up with either a send error report box, or an error 80071392, but i try signing into every other account, and it works, and then i signed into the other computer's msn and it worked, just on my computer it refuses to work, it also works on web messenger and stuff just not on msn, can somebody pleaseee tell me how to fix it, im desperate!!
thanks,